Why do cells need buffering agents?

a. to operate at a constant pH of 2.0
b. to help transfer electrons from one atom to another
c. to minimize the changes in pH of their internal environment
d. to increase the amount of OH- in their surroundings


Ans: c. to minimize the changes in pH of their internal environment

Biology & Microbiology

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The renal cortex contains _______, which remove and concentrate wastes to form urine.

a. the nephrons b. the ureter c. the urethra d. plasma

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What is different about ferns compared to seed

producing plants?

a. they have a gametophyte stage b. they produce spores c. the zygote develops into a sporophyte d. the roots form from an underground stem e. more than one of these is different about ferns

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The density of woody vegetation in a savanna is controlled through

A) mean annual temperature. B) mean annual temperature, soil texture, and water-holding capacity. C) mean annual precipitation. D) mean annual precipitation, soil texture, and water-holding capacity.

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Which of the following is LEAST associated with the others?

A) horizontal gene transfer B) conjugation C) transformation D) binary fission

Biology & Microbiology